gh-104533: Fix ctypes test_pointer_proto_missing_argtypes_error() (#154169)

https://github.com/python/cpython/commit/da5713c489c63622c0fdd25343a7ea7293a66e68
commit: da5713c489c63622c0fdd25343a7ea7293a66e68
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-07-19T16:24:12Z
summary:

gh-104533: Fix ctypes test_pointer_proto_missing_argtypes_error() (#154169)

Save/restore Py_GetVersion.argtypes, since Py_GetVersion is used in
another test.

files:
M Lib/test/test_ctypes/test_pointers.py

diff --git a/Lib/test/test_ctypes/test_pointers.py b/Lib/test/test_ctypes/test_pointers.py
index 771cc8fbe0ec93..78480af34474a5 100644
--- a/Lib/test/test_ctypes/test_pointers.py
+++ b/Lib/test/test_ctypes/test_pointers.py
@@ -11,6 +11,7 @@
                     c_long, c_ulong, c_longlong, c_ulonglong,
                     c_float, c_double)
 from ctypes import _pointer_type_cache, _pointer_type_cache_fallback
+from test import support
 from test.support import import_helper
 from weakref import WeakSet
 _ctypes_test = import_helper.import_module("_ctypes_test")
@@ -409,10 +410,9 @@ class BadType(ctypes._Pointer):
             pass
 
         func = ctypes.pythonapi.Py_GetVersion
-        func.argtypes = (BadType,)
-
-        with self.assertRaises(ctypes.ArgumentError):
-            func(object())
+        with support.swap_attr(func, 'argtypes', (BadType,)):
+            with self.assertRaises(ctypes.ArgumentError):
+                func(object())
 
 class PointerTypeCacheTestCase(unittest.TestCase):
     # dummy tests to check warnings and base behavior

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